27681593 has 4 divisors (see below), whose sum is σ = 29309940. Its totient is φ = 26053248.

The previous prime is 27681571. The next prime is 27681671. The reversal of 27681593 is 39518672.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25482304 + 2199289 = 5048^2 + 1483^2 .

It is not a de Polignac number, because 27681593 - 2⁸ = 27681337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27681593.

It is not an unprimeable number, because it can be changed into a prime (27681523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814148 + ... + 814181.

It is an arithmetic number, because the mean of its divisors is an integer number (7327485).

Almost surely, 2^27681593 is an apocalyptic number.

It is an amenable number.

27681593 is a deficient number, since it is larger than the sum of its proper divisors (1628347).

27681593 is a wasteful number, since it uses less digits than its factorization.

27681593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628346.

The product of its digits is 90720, while the sum is 41.

The square root of 27681593 is about 5261.3299649423. The cubic root of 27681593 is about 302.5034692132.

The spelling of 27681593 in words is "twenty-seven million, six hundred eighty-one thousand, five hundred ninety-three".